Passage Two-|||-Questions 51 to 55 are based on the following passage.-|||-Google researchers have used artificial intellige (AI)to teach robots how to move like real animals(in this case,-|||-dogs).They describe their experiment in a blog released this week.-|||-"First,we describe how robots can learn to move like a real animal by imitating their motions, producing fast and fluent-|||-movements like running slowly and hopping.Then,we discuss a system for automating the training of moving skills in the-|||-real world,which allows robots to learn to walk on their own,with minimal human assistance,"shared in the blog Xue Bin-|||-(Jason)Peng,Student Researcher and Sehoon Ha,Research Scientist,Robotics at Google.-|||-They achieved this impressive feat by using something called reinforcement learning (R They began by taking a-|||-reference video recorded from an animal and using RL to get the robot to imitate an animal`s movement.-|||-"By providing the system with different reference motions,we are able to train an animal shaped robot to perform a-|||-diverse set of agile behaviors, ranging from fast walking to dynamic hops and turns.The policies are trained primarily in-|||-simulation(模拟,模仿),and then transferred to the real world using a space adaptation technique that can efficiently adapt-|||-policy using only a few minutes of data from the real robot,"wrote the researchers in their blog.-|||-However,it is a well-known fact that simulators provide a poor approximation of the real world,meaning that-|||-simulations don`t perform well in reality.This is where the researchers decided to use a sample-efficient space ad-|||-technique.-|||-They did so by introducing an element of randomness to the physical parameters(参数)used in the simulation by varying-|||-physical quantities, such as the robot`s mass and friction.This resulted in a machine learning model that could account for all-|||-kinds of small changes and the complications they create-|||-The end result is a robot that moves like a real dog.This kind of work is crucial as it can open opportunities to use robots-|||-to do sophisticated tasks in the real world.-|||-51.What is Google researchers` exper about?-|||-A)Developing the first AI dog like robot.-|||-B)Training robots to move like a real dog.-|||-C)Making a running dog video with AI tech.-|||-D)Designing a new AI device to make robots-|||-52.How did the researchers make the breakthrough?-|||-A)By using bionic technology-|||-B) ykparallel sin B 3-DPsin tsin gtech.-|||-C)By employing the method of RL-|||-D)By applying the 5G technology.-|||-53.Why did researchers decide to use a sample-efficient space adaption technique?-|||-A)Because they hated to experiment on animals.-|||-B)Because they intended to reduce research cost.-|||-C)Because the robotic technology was unable to update.-|||-D)Because simulators don`t simulate the real world well.-|||-54.What have researchers taken into account to simulate the reality?-|||-A)The mass and friction of the robot.-|||-B)The color and sound of the robot.-|||-C)The light and the space of the lab-|||-D)The competence of the operator.-|||-55.Why is the new technology Google developed so important?-|||-A)Because it has shed new light on cloning technology.-|||-B)Because it has opened chances for us to control robots.-|||-C)Because it can promote the application of robotic technology.-|||-D)Because it can enable r do more tasks in the laboratory.